One feature that is perennially requested is “We need to export to Excel” this is a feature smell, similar to a code smell.
Why are your users exporting to Excel?
What are they doing in Excel that they can’t do in your app?
If there are reports or charts that aren’t available in your app add them.
Exporting to Excel is a horrible idea because once the data is out of your system it’s immediately out of date and stands a real possibility of being wrong.